resource/rabbitmq_user - fix password issue when updating user tags

[heimweh]

This PR fixes #40 by setting the password in the user settings.
Without this, any changes to the tags will break the password for an existing user.

[heimweh]

Tests are passing:

$ make testacc TEST=./rabbitmq
==> Checking that code complies with gofmt requirements...
TF_ACC=1 go test ./rabbitmq -v -count=1 -timeout 120m
=== RUN   TestAccBinding_importBasic
--- PASS: TestAccBinding_importBasic (0.46s)
=== RUN   TestAccExchange_importBasic
--- PASS: TestAccExchange_importBasic (0.38s)
=== RUN   TestAccPermissions_importBasic
--- PASS: TestAccPermissions_importBasic (0.35s)
=== RUN   TestAccPolicy_importBasic
--- PASS: TestAccPolicy_importBasic (0.41s)
=== RUN   TestAccQueue_importBasic
--- PASS: TestAccQueue_importBasic (0.36s)
=== RUN   TestAccUser_importBasic
--- PASS: TestAccUser_importBasic (0.06s)
=== RUN   TestAccVhost_importBasic
--- PASS: TestAccVhost_importBasic (0.32s)
=== RUN   TestProvider
--- PASS: TestProvider (0.00s)
=== RUN   TestProvider_impl
--- PASS: TestProvider_impl (0.00s)
=== RUN   TestAccBinding_basic
--- PASS: TestAccBinding_basic (0.41s)
=== RUN   TestAccBinding_slashEscaping
--- PASS: TestAccBinding_slashEscaping (0.45s)
=== RUN   TestAccBinding_propertiesKey
--- PASS: TestAccBinding_propertiesKey (0.41s)
=== RUN   TestAccExchange
--- PASS: TestAccExchange (0.35s)
=== RUN   TestAccPermissions
--- PASS: TestAccPermissions (0.38s)
=== RUN   TestAccPolicy
--- PASS: TestAccPolicy (0.46s)
=== RUN   TestAccQueue_basic
--- PASS: TestAccQueue_basic (0.38s)
=== RUN   TestAccQueue_jsonArguments
--- PASS: TestAccQueue_jsonArguments (0.37s)
=== RUN   TestAccUser_basic
--- PASS: TestAccUser_basic (0.11s)
=== RUN   TestAccUser_emptyTag
--- PASS: TestAccUser_emptyTag (0.13s)
=== RUN   TestAccUser_noTags
--- PASS: TestAccUser_noTags (0.10s)
=== RUN   TestAccUser_passwordChange
--- PASS: TestAccUser_passwordChange (0.10s)
=== RUN   TestAccVhost
--- PASS: TestAccVhost (0.31s)
PASS
ok  	github.com/terraform-providers/terraform-provider-rabbitmq/rabbitmq	6.325s

[mbfrahry]

LGTM

[cyrilgdn]

@heimweh FYI #31 was already fixing this (and was adding some unit tests to assert this fix) .

[heimweh]

Hey @cyrilgdn,

Sorry! I must’ve completely missed your fix.
@mbfrahry can you take a look at #31 instead? 🙏

Best,

Alexander

[cyrilgdn]

Hi @heimweh ,

Actually I asked to become a maintainer of this repo (as I was already maintainer of another provider) so I'm now able to manager pull requests.
I'll close this one in favor of #31.

As you worked on this, could you make a review of mine and if it's ok for you we'll merge it.